Apparatus for hammering piston-rings



c. LAUFF'ET. APPARATUS FOR HAMMERING PISTON RINGS.

APPLICATION HLED SEPT. 2, I919.

Patented May 10,1921.

INV R ER (muss LAUFFET,

al'lial-nvs.

c.- LAUF FET. APPARATUS FOR HAMMERING PISTON RINGS.

APPLICATION FILED SEPT. 2. 1919- Patented May 10, 1921. 7

6 rpEET-SHEET 2.

CHARLES Lear-F ET:

c. LAUFFET. APPARATUS FOR HAMMERING PISTON RINGS.

APPLICATION FILED SEPT.Z, I919. I

Patented May 10,- 1921.

6 SHEETSSHEET 3- Fig. 3

IN YENTAR.

UHARLEs LAUFFET C.LAUFFET. APPARATUS FOR HAMMER-ING PIS-TON RINGS,APPLICATIONFILED'SEPT-i2191 9.

1,377,967. Patented my 10; 1921 6* wens-sun '4.

15 IN Ill/v To R C/MRL ES LAUFFET earn" c ya.

C. LAUFFET. APPARATUS FOR HAMMERING PISTON RINGS.

APPLICATWN FILED SEPT. 2; I919- Patented May 10, 1921.

'6 suns-auger- 5;

, c. LAUFFET.

APPARATU"S.FOR HAMMERING Pl-STON' RINGS.

- APPLICATION FILED SEPT. 2, 1919.

6 SHEETSSHEET 6.

fumes LAUFFEI f atented May 10, 1921.

7 CHARLES LAUFFET, or rams, FRANCE.

UNITED srrsgyorifice APPARATUS FOR HAMMERING rrsron-nines.

To all whom it may concern:

Be'it known that CHARLES LAUFFET, of 46 Rue St. Ferdinand, Paris France,a citizen of the French Republic, (whose post-ofiice address is 46 RueSt. Ferdinand, Paris,

France,) has invented certain new and use ful Improvements'in Apparatusfor Ham- I mering Piston-Rings, of which the following is aspecification.

Rings for explosion motor pistons, the internal surface of which has aseries of grooves or recesses produced by hammering with the object ofincreasing the elasticity of these rings and thus enabling them to actmore effectively are well known.

The present invention consists in an apparatus which enables thehammering of i the said rings to be effected automatically thevariations of spacing being made wlth very great precision and :moreoverbeing capable of modification as desired by a very simple operation.This machlne comprises two essential parts; on the one hand themechanism for operating the graver which during the working is subjected'to a uniform alternat ing rectilined movement; on the other hand amechanism serving to cause the ring that is to be worked to rotate infront of the graver the rotary movement thus imparted to the ring beinguniformly varied so as to obtain the desired variations in the spacing.

In the accompanying drawing one form of hammering apparatus inaccordance with the invention is illustrated by way of example.

Figure 1 is a front elevation of the whole apparatus.

Fig. 2 is a plan view thereof.

Fig. 3 is a detail view on a larger scale showing in front elevation thedevice by means of which the graver is operated;

Fig. 4 is a section of the same-mechanism taken through I I in Fig. 3. V

Figs. 5 to 10 are diagrams explanatory of the mechanism by means ofwhich the varied uniform rotary movement of the ring that is to behammered is produced.

In this apparatus as has been stated the ring 1 which is to be hammeredrotates opposite the graver 2. The alternating recti linear movement'ofthe said graver is produced in the following manner: The roller When theroller leaves a tooth of the said Specification of'Letters Patent.Patented hi 10 1921 Application filed. September 2, 1919. Serial No.321,231.

wheel the springs 5 cause it to drop abruptly; the graver thus strikesthe point in; the ring which is in front of it .at that moment. Thegraver is guided in its move.- ment by the slide 7' which moves betweenthe exterior slides 7 that are mounted on the fixed frame 8. 'A pin 9enables the graver 2 to be made stationary when'this is expedient. o i

The ratchet wheel 4 is actuated by the main shaft 10. On this shaft (seeFlg. 2)

the staged pulleys 11 are mounted L which enable the speed of theapparatus to be varied. r

The ring 1 which is to be hammered is supported by a crown 12 which isput in place at each operation by means of sockets 13 in which thescrews 14 engage which are fixed in the casing 15.

The casing 15 rotates around the frame 8. In order to insure ltheactuating of the ring a toothed rim 16 is placed on it which is actuatedby a chain 17. i

' The chain is operated by a toothed wheel 18 in which an opening 19 iscut that runs from the center and has a radial direction.

In the opening 19 the shaft 20 of the pulley 21 engages. Through themedium of the belt 22 this pulley receives the movement of the pulley 23that is mountedon the main 7 or actuating shaft 10 (see Figs. 1 and Thisarrangement enables the wheel 18 to be ex-centered more or less inrelation to the pulley 21 for the purpose of effecting the variations ofspeed.

The chain 17 is put under tension by a loose pinion 24 fixed to the endof a lever .25 that moves around a pin 26 a spring 27 junction isopposite the graver for example.

The eccentricity of the wheel 18 in relation 1 to the pulley 21 havingbeensuitably regulated in accordance with the variations of speed whichit is desired to obtain the pin 9 is removed and the hammeringeflfected.

The mechanism by means of which the ring is rotated acts in thefollowing manner: If the centers 0 and o of the actuating pulley 21 andthe wheel 18 (w) coincide the ring is subjected to a rotary motion ofuniform speed. In this case the recesses or' grooves formed in the ringare thus uniformly spaced (case of Fig. 9').

If it be desired to obtain recesses with variable spacing for theproduction of rings ofthe kind described in the before mentioned patentapplication the wheel 18 is excentral more or less in relation to thepulley 21 by moving thepi-n in the opening 19. Fig. 1 shows the positionof maximum .eccentricity. This'mechanism acts as shown by the diagramsof Figs. 5, 6, 7, 8 and 10.

When the apparatus works in these conditions the center 0" of the wheel18 rotates around the center 9 of the actuating pulley 21." It is easyto understand if the dia grams of Figs. 6, 7, 8 and 10 be consideredthat in these conditions-the rotary speedof the wheel X [(18) increasesfrom a to f.

that is to say during half the course, then center 0 in consequence ofthe eccentricity.

On the other hand the wheel 16 being connectedwith the wheel 18 throughthe chain,

the rotary speed of the wheel 16 ateach instant is equal or proportionalto that of the wheel 18 according to the respective diameters of thesetwo wheels; The ring itself which is firmly connected with the wheel 16thus rotates with a uniformly varied movement the speed being at aminimum at the point in the said segment diametrically opposite to thepoint of junction. It is evident that the greater the speed of the ringthe greater is the distance between the recesses produced by the graver.

I claim a p a 1. A machine for hammeringipis'ton rings comprising ahammer, means including ,a ratchet wheel and roller torfreciproca-tingsaid hammer, means for supporting a piston ring and driving means forimparting.

a uniform reciprocating motion to the hammer and adapted'to be adjustedto impart either a uniform rotary or a uniformly vi1-' ried rotarymotion to the ring.

2. A machine for hammering piston rings comprising .a hammer meansincluding a ratchet wheel and roller for reciprocating said-hammer,means for supporting a piston ring'and means including a wheel andactuating pulley for rotating the piston ring and adjustingmeans wherebythe center of the wheel is movable in relation to the cen-' terof thepulley to vary the motion conveyed to the ring. y I 1 'In testimony hehas 'al'HXed his signature, in presence of two witnesses.

. 7 CHARLES Witnesses: r GHAs. P. PREssLY,

EMILE Bnnrnanor.

LAUFFET. h

